Thunderbird version: 128.11.1esr IMAP: Server Name: partner.outlook.cn Port: 993 User Name: [name@domain] Authentication method: OAuth2 Connection Security: SSL/TLS

SMTP: Server Name: smtp.partner.outlook.cn Port: 587 User Name: [name@domain] Authentication method: non OAuth2 Connection Security: STARTTLS

not working Chinese version M365

Thanks .

I do not see that domain listed in the scopes of Thunderbird, so I think you best file a bug in bugzilla for the issue

There is an open bug report at https://bugzilla.mozilla.org/show_bug.cgi?id=1780765